prosody
24a1e7a9d463
util-src/signal.c

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util-src/signal.c @ 9139:24a1e7a9d463

mod_pubsub, mod_pep: The "restricted" affiliation should be allowed to be unsubscribed but nothing else Can't revoke their subscriptions on change of access model otherwise
author Kim Alvefur <zash@zash.se>
date Mon, 06 Aug 2018 18:33:33 +0200
parent 8420:fb27aff6d491
child 9150:c1d5f52274cf
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1 /*
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2 * signal.c -- Signal Handler Library for Lua
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3 *
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4 * Version: 1.000+changes
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5 *
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6 * Copyright (C) 2007 Patrick J. Donnelly (batrick@batbytes.com)
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7 *
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8 * This software is distributed under the same license as Lua 5.0:
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9 *
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10 * Permission is hereby granted, free of charge, to any person obtaining a
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11 * copy of this software and associated documentation files (the "Software"),
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12 * to deal in the Software without restriction, including without limitation
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13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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14 * and/or sell copies of the Software, and to permit persons to whom the
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15 * Software is furnished to do so, subject to the following conditions:
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16 *
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17 * The above copyright notice and this permission notice shall be included
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18 * in all copies or substantial portions of the Software.
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19 *
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20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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26 * OTHER DEALINGS IN THE SOFTWARE.
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27 */
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28
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29 #define _GNU_SOURCE
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30
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31 #include <signal.h>
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32 #include <stdlib.h>
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33
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34 #include "lua.h"
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35 #include "lauxlib.h"
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36
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37 #if (LUA_VERSION_NUM == 501)
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38 #define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R)
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39 #endif
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40
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41 #ifndef lsig
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42
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43 #define lsig
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44
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45 struct lua_signal {
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46 char *name; /* name of the signal */
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47 int sig; /* the signal */
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48 };
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49
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50 #endif
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51
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52 #define MAX_PENDING_SIGNALS 32
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53
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54 #define LUA_SIGNAL "lua_signal"
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55
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56 static const struct lua_signal lua_signals[] = {
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57 /* ANSI C signals */
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58 #ifdef SIGABRT
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59 {"SIGABRT", SIGABRT},
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60 #endif
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61 #ifdef SIGFPE
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62 {"SIGFPE", SIGFPE},
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63 #endif
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64 #ifdef SIGILL
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65 {"SIGILL", SIGILL},
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66 #endif
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67 #ifdef SIGINT
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68 {"SIGINT", SIGINT},
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69 #endif
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70 #ifdef SIGSEGV
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71 {"SIGSEGV", SIGSEGV},
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72 #endif
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73 #ifdef SIGTERM
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74 {"SIGTERM", SIGTERM},
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75 #endif
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76 /* posix signals */
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77 #ifdef SIGHUP
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78 {"SIGHUP", SIGHUP},
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79 #endif
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80 #ifdef SIGQUIT
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81 {"SIGQUIT", SIGQUIT},
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82 #endif
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83 #ifdef SIGTRAP
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84 {"SIGTRAP", SIGTRAP},
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85 #endif
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86 #ifdef SIGKILL
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87 {"SIGKILL", SIGKILL},
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88 #endif
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89 #ifdef SIGUSR1
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90 {"SIGUSR1", SIGUSR1},
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91 #endif
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92 #ifdef SIGUSR2
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93 {"SIGUSR2", SIGUSR2},
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94 #endif
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95 #ifdef SIGPIPE
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96 {"SIGPIPE", SIGPIPE},
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97 #endif
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98 #ifdef SIGALRM
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99 {"SIGALRM", SIGALRM},
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100 #endif
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101 #ifdef SIGCHLD
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102 {"SIGCHLD", SIGCHLD},
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103 #endif
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104 #ifdef SIGCONT
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105 {"SIGCONT", SIGCONT},
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106 #endif
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107 #ifdef SIGSTOP
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108 {"SIGSTOP", SIGSTOP},
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109 #endif
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110 #ifdef SIGTTIN
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111 {"SIGTTIN", SIGTTIN},
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112 #endif
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113 #ifdef SIGTTOU
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114 {"SIGTTOU", SIGTTOU},
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115 #endif
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116 /* some BSD signals */
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117 #ifdef SIGIOT
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118 {"SIGIOT", SIGIOT},
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119 #endif
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120 #ifdef SIGBUS
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121 {"SIGBUS", SIGBUS},
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122 #endif
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123 #ifdef SIGCLD
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124 {"SIGCLD", SIGCLD},
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125 #endif
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126 #ifdef SIGURG
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127 {"SIGURG", SIGURG},
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128 #endif
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129 #ifdef SIGXCPU
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130 {"SIGXCPU", SIGXCPU},
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131 #endif
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132 #ifdef SIGXFSZ
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133 {"SIGXFSZ", SIGXFSZ},
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134 #endif
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135 #ifdef SIGVTALRM
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136 {"SIGVTALRM", SIGVTALRM},
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137 #endif
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138 #ifdef SIGPROF
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139 {"SIGPROF", SIGPROF},
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140 #endif
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141 #ifdef SIGWINCH
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142 {"SIGWINCH", SIGWINCH},
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143 #endif
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144 #ifdef SIGPOLL
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145 {"SIGPOLL", SIGPOLL},
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146 #endif
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147 #ifdef SIGIO
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148 {"SIGIO", SIGIO},
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149 #endif
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150 /* add odd signals */
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151 #ifdef SIGSTKFLT
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152 {"SIGSTKFLT", SIGSTKFLT}, /* stack fault */
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153 #endif
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154 #ifdef SIGSYS
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155 {"SIGSYS", SIGSYS},
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156 #endif
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157 {NULL, 0}
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158 };
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159
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160 static lua_State *Lsig = NULL;
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161 static lua_Hook Hsig = NULL;
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162 static int Hmask = 0;
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163 static int Hcount = 0;
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164
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165 int signals[MAX_PENDING_SIGNALS];
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166 int nsig = 0;
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167
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168 static void sighook(lua_State *L, lua_Debug *ar) {
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169 /* restore the old hook */
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170 lua_sethook(L, Hsig, Hmask, Hcount);
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171
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172 lua_pushstring(L, LUA_SIGNAL);
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173 lua_gettable(L, LUA_REGISTRYINDEX);
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174
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175 for(int i = 0; i < nsig; i++) {
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176 lua_pushnumber(L, signals[i]);
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177 lua_gettable(L, -2);
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178 lua_call(L, 0, 0);
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179 };
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180
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181 nsig = 0;
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182
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183 lua_pop(L, 1); /* pop lua_signal table */
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184
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185 }
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186
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187 static void handle(int sig) {
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188 if(nsig == 0) {
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189 /* Store the existing debug hook (if any) and its parameters */
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190 Hsig = lua_gethook(Lsig);
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191 Hmask = lua_gethookmask(Lsig);
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192 Hcount = lua_gethookcount(Lsig);
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193
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194 /* Set our new debug hook */
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195 lua_sethook(Lsig, sighook, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
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196 }
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197
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198 if(nsig < MAX_PENDING_SIGNALS) {
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199 signals[nsig++] = sig;
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200 }
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201 }
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202
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203 /*
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204 * l_signal == signal(signal [, func [, chook]])
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205 *
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206 * signal = signal number or string
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207 * func = Lua function to call
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208 * chook = catch within C functions
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209 * if caught, Lua function _must_
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210 * exit, as the stack is most likely
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211 * in an unstable state.
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212 */
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213
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214 static int l_signal(lua_State *L) {
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215 int args = lua_gettop(L);
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216 int t, sig; /* type, signal */
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217
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218 /* get type of signal */
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219 luaL_checkany(L, 1);
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220 t = lua_type(L, 1);
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221
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222 if(t == LUA_TNUMBER) {
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223 sig = (int) lua_tonumber(L, 1);
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224 } else if(t == LUA_TSTRING) {
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225 lua_pushstring(L, LUA_SIGNAL);
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226 lua_gettable(L, LUA_REGISTRYINDEX);
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227 lua_pushvalue(L, 1);
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228 lua_gettable(L, -2);
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229
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230 if(!lua_isnumber(L, -1)) {
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231 return luaL_error(L, "invalid signal string");
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232 }
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233
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234 sig = (int) lua_tonumber(L, -1);
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235 lua_pop(L, 1); /* get rid of number we pushed */
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236 } else {
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237 luaL_checknumber(L, 1); /* will always error, with good error msg */
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238 return luaL_error(L, "unreachable: invalid number was accepted");
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239 }
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240
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241 /* set handler */
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242 if(args == 1 || lua_isnil(L, 2)) { /* clear handler */
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243 lua_pushstring(L, LUA_SIGNAL);
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244 lua_gettable(L, LUA_REGISTRYINDEX);
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245 lua_pushnumber(L, sig);
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246 lua_gettable(L, -2); /* return old handler */
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247 lua_pushnumber(L, sig);
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248 lua_pushnil(L);
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249 lua_settable(L, -4);
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250 lua_remove(L, -2); /* remove LUA_SIGNAL table */
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251 signal(sig, SIG_DFL);
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252 } else {
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253 luaL_checktype(L, 2, LUA_TFUNCTION);
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254
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255 lua_pushstring(L, LUA_SIGNAL);
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256 lua_gettable(L, LUA_REGISTRYINDEX);
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257
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258 lua_pushnumber(L, sig);
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259 lua_pushvalue(L, 2);
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260 lua_settable(L, -3);
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261
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262 /* Set the state for the handler */
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263 Lsig = L;
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264
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265 if(lua_toboolean(L, 3)) { /* c hook? */
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266 if(signal(sig, handle) == SIG_ERR) {
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267 lua_pushboolean(L, 0);
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268 } else {
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269 lua_pushboolean(L, 1);
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270 }
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271 } else { /* lua_hook */
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272 if(signal(sig, handle) == SIG_ERR) {
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273 lua_pushboolean(L, 0);
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274 } else {
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275 lua_pushboolean(L, 1);
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276 }
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277 }
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278 }
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279
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280 return 1;
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281 }
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282
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283 /*
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284 * l_raise == raise(signal)
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285 *
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286 * signal = signal number or string
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287 */
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288
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289 static int l_raise(lua_State *L) {
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290 /* int args = lua_gettop(L); */
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291 int t = 0; /* type */
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292 lua_Number ret;
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293
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294 luaL_checkany(L, 1);
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295
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296 t = lua_type(L, 1);
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297
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298 if(t == LUA_TNUMBER) {
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299 ret = (lua_Number) raise((int) lua_tonumber(L, 1));
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300 lua_pushnumber(L, ret);
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301 } else if(t == LUA_TSTRING) {
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302 lua_pushstring(L, LUA_SIGNAL);
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303 lua_gettable(L, LUA_REGISTRYINDEX);
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304 lua_pushvalue(L, 1);
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305 lua_gettable(L, -2);
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306
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307 if(!lua_isnumber(L, -1)) {
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308 return luaL_error(L, "invalid signal string");
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309 }
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310
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311 ret = (lua_Number) raise((int) lua_tonumber(L, -1));
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312 lua_pop(L, 1); /* get rid of number we pushed */
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313 lua_pushnumber(L, ret);
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314 } else {
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315 luaL_checknumber(L, 1); /* will always error, with good error msg */
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316 }
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317
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318 return 1;
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319 }
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320
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321 #if defined(__unix__) || defined(__APPLE__)
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322
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323 /* define some posix only functions */
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324
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325 /*
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326 * l_kill == kill(pid, signal)
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327 *
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328 * pid = process id
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329 * signal = signal number or string
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330 */
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331
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332 static int l_kill(lua_State *L) {
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333 int t; /* type */
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334 lua_Number ret; /* return value */
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335
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336 luaL_checknumber(L, 1); /* must be int for pid */
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337 luaL_checkany(L, 2); /* check for a second arg */
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338
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339 t = lua_type(L, 2);
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340
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341 if(t == LUA_TNUMBER) {
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342 ret = (lua_Number) kill((int) lua_tonumber(L, 1),
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343 (int) lua_tonumber(L, 2));
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344 lua_pushnumber(L, ret);
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345 } else if(t == LUA_TSTRING) {
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346 lua_pushstring(L, LUA_SIGNAL);
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347 lua_gettable(L, LUA_REGISTRYINDEX);
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348 lua_pushvalue(L, 2);
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349 lua_gettable(L, -2);
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350
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351 if(!lua_isnumber(L, -1)) {
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352 return luaL_error(L, "invalid signal string");
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353 }
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354
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355 ret = (lua_Number) kill((int) lua_tonumber(L, 1),
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356 (int) lua_tonumber(L, -1));
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357 lua_pop(L, 1); /* get rid of number we pushed */
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358 lua_pushnumber(L, ret);
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359 } else {
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360 luaL_checknumber(L, 2); /* will always error, with good error msg */
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361 }
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362
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363 return 1;
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364 }
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365
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366 #endif
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367
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368 static const struct luaL_Reg lsignal_lib[] = {
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369 {"signal", l_signal},
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370 {"raise", l_raise},
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371 #if defined(__unix__) || defined(__APPLE__)
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372 {"kill", l_kill},
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373 #endif
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374 {NULL, NULL}
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375 };
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376
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377 int luaopen_util_signal(lua_State *L) {
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378 #if (LUA_VERSION_NUM > 501)
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379 luaL_checkversion(L);
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380 #endif
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381 int i = 0;
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382
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383 /* add the library */
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384 lua_newtable(L);
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385 luaL_setfuncs(L, lsignal_lib, 0);
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386
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387 /* push lua_signals table into the registry */
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388 /* put the signals inside the library table too,
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389 * they are only a reference */
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390 lua_pushstring(L, LUA_SIGNAL);
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391 lua_newtable(L);
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392
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393 while(lua_signals[i].name != NULL) {
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394 /* registry table */
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395 lua_pushstring(L, lua_signals[i].name);
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396 lua_pushnumber(L, lua_signals[i].sig);
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397 lua_settable(L, -3);
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398 /* signal table */
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399 lua_pushstring(L, lua_signals[i].name);
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400 lua_pushnumber(L, lua_signals[i].sig);
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401 lua_settable(L, -5);
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402 i++;
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403 }
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404
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405 /* add newtable to the registry */
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406 lua_settable(L, LUA_REGISTRYINDEX);
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407
6615
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
408 return 1;
988
8cb9a0d59e78 util.lsignal: Add lsignal library for catching POSIX signals
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
409 }